in chapter 17
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"Mrs. Bennet was perfectly satisfied; and quitted the house under the delightful persuasion that, allowing for the necessary preparations of settlements, new carriages, and wedding clothes, she should undoubtedly see her daughter settled at Netherfield in the course of three or four months. Of having another daughter married to Mr. Collins, she thought with equal certainty, and with considerable, though not equal, pleasure. Elizabeth was the least dear to her of all her children; and though the man and the match were quite good enough for her, the worth of each was eclipsed by Mr. Bingley and Netherfield."
Mrs. Bennett has been embarrassing her girls all evening, but the above quote comes from Chapter 18. I find noting else in the chapter that alludes to Collin's proposing to Elizabeth, and most of the chapter talks about her sister and the "hopeful" match she'll make with Mr. Bingley. Chapter 19 however, immediately turns to Mr. Collin's official proposal and Elizabeth is completely negative about the entire affair.
Pride and Prejudice/ Chapters 17,19,19